In order to wake from suspend by ethernet magic packets the GPC
must be used as intc does not have wakeup functionality.

But the FEC DT node currently uses interrupt-extended,
specificying intc, thus breaking WoL.

This problem is probably fallout from the stacked domain conversion
as intc used to chain to GPC.

So replace "interrupts-extended" by "interrupts" to use the default
parent which is GPC.

Fixes: b923ff6a ("ARM: imx6: convert GPC to stacked domains")
Signed-off-by: NMartin Fuzzey <martin.fuzzey@flowbird.group>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>